22201220011221 has 10 divisors (see below), whose sum is σ = 33164785448982. Its totient is φ = 14800813340760.

The previous prime is 22201220011183. The next prime is 22201220011237. The reversal of 22201220011221 is 12211002210222.

It is a happy number.

22201220011221 is a `hidden beast` number, since 2 + 220 + 1 + 220 + 0 + 1 + 1 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11873744388900 + 10327475622321 = 3445830^2 + 3213639^2 .

It is not a de Polignac number, because 22201220011221 - 2²¹ = 22201217914069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22201220011194 and 22201220011203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22201220011241) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 137044567890 + ... + 137044568051.

Almost surely, 2^{22201220011221} is an apocalyptic number.

It is an amenable number.

22201220011221 is a deficient number, since it is larger than the sum of its proper divisors (10963565437761).

22201220011221 is an equidigital number, since it uses as much as digits as its factorization.

22201220011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274089135953 (or 274089135944 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 22201220011221 its reverse (12211002210222), we get a palindrome (34412222221443).

The spelling of 22201220011221 in words is "twenty-two trillion, two hundred one billion, two hundred twenty million, eleven thousand, two hundred twenty-one".